<template>
          <view>
            <my-search :bgcolor="'#c00000'" :radius="18" @click="gotoSearch"></my-search>
            <!-- <my-search></my-search> -->
            <view class="scroll-view-container">
              <!-- 左滑区域 -->
              <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
                <block v-for="(item, i) in cateList" :key="i">
                  <view :class="['left-scroll-view-item', i === active ? 'active':'']" @click="activeChange(i)">{{item.cat_name}}</view>
                </block>
                
              </scroll-view>
              <!-- 右滑区域 -->
              <scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
                <view class="cate-lv2" v-for="(item2, i2) in catelevel2" :key="i2">
                  <!-- 二级分类标题 -->
                  <view class="cate-lv2-title">
                    /{{item2.cat_name}}/
                  </view>
                  <!-- 二级分类下的三级分类 -->
                  <view class="cate-lv3-list" >
                    <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="getoGoodsList(item3)">
                      <!-- 三级分类的图片 -->
                      <img :src="item3.cat_icon" alt="" />
                      <!-- 三级分类的文本 -->
                      <text>{{item3.cat_name}}</text>
                    </view>
                  </view>
                </view>
                
              </scroll-view>
            </view>      
          </view>
</template>

<script>
          export default {
                    data() {
                              return {
                                // 设备可用高度
                                wh: 0,
                                cateList: [],
                                active: 0,
                                catelevel2: [],
                                scrollTop: 0
                                        
                              };
                    },
                    onLoad() {
                      // 获取当前系统的信息
                      const sysInfo = uni.getSystemInfoSync()
                      // 为 wh 窗口可用高度动态赋值
                      this.wh = sysInfo.windowHeight - 50
                      this.getCateList()
                    },
                    methods: {
                      // 获取分类数据
                      async getCateList() {
                        const {data: res} = await uni.$http.get('/api/public/v1/categories')
                        if(res.meta.status !== 200) return uni.$showMsg()
                        this.cateList = res.message
                        this.catelevel2 = res.message[0].children
                        // console.log(this.catelevel2)
                      },
                      activeChange(i) {
                        this.active = i
                        // console.log(i)
                        this.catelevel2 = this.cateList[i].children
                        // console.log(this.catelevel2)
                        this.scrollTop = this.scrollTop === 0? -1:0
                      },
                      getoGoodsList(item) {
                        uni.navigateTo({
                          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
                        })
                      },
                      gotoSearch() {
                        // console.log('ok')
                        uni.navigateTo({
                          url:'/subpkg/search/search'
                        })
                      }
                    }
          }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    .left-scroll-view {
      width: 120px;
    }
    
    .left-scroll-view-item {
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
        
        // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
    .cate-lv2-title {
      font-size: 15px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    
    .cate-lv3-list {
      display: flex;
      // 自动换行
      flex-wrap: wrap;
      .cate-lv3-item{
        width: 33.33%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        image {
          width: 60px;
          height: 60px;
        }
        text {
          font-size: 12px;
        }
      }
    }
  }

</style>
